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Commitments and Contingencies - Additional Information (Detail) (USD $)
In Millions, unless otherwise specified
12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Dec. 21, 2001
Commitments and Contingencies [Line Items]        
Acquired interest percentage       33.80%
Accrued liabilities related to retained risks $ 146.4 $ 168.2    
Rent expenses 124.7 126.2 132.1  
Minimum
       
Commitments and Contingencies [Line Items]        
Lease term, (years) 1 year      
Maximum
       
Commitments and Contingencies [Line Items]        
Lease term, (years) 20 years      
Contingent Promissory Note
       
Commitments and Contingencies [Line Items]        
Principal amount of contingent promissory note 40      
Promissory note term 20 years      
Contingent promissory note, maximum amount including interest $ 96      
Promissory note, maturity date Dec. 21, 2021